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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077a964c08d6c470b50f916bb463f200ab66a8d10cb7f816adeee7d52677ab7a' 
  AND token = '1loorgikunUAl+thZxzv/Zj4M5Tzvt8OTHl2aLW3IR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}